Switching regulator based on switched‐inductor SEPIC DC‐DC converter with a continuous input current for lithium‐ion batteries
Abstract This study discusses a control strategy applied to the switched‐inductor single‐ended primary‐inductance converter (SEPIC) converter suitable for applications where the voltage delivered by a DC source varies from above or below the nominal value. The SEPIC converter can provide a non‐isola...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-04-01
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| Series: | IET Power Electronics |
| Online Access: | https://doi.org/10.1049/pel2.12080 |
| Summary: | Abstract This study discusses a control strategy applied to the switched‐inductor single‐ended primary‐inductance converter (SEPIC) converter suitable for applications where the voltage delivered by a DC source varies from above or below the nominal value. The SEPIC converter can provide a non‐isolated positive output voltage for the above applications; moreover, it exhibits better characteristics when combined with a switched‐inductor cell. A design‐oriented procedure is given that appropriately selects the elements of the converter for a given output voltage and power delivery requirements. A control scheme with two loops is chosen. A high‐gain compensator is used in the inner loop such that the average inductor current follows a current reference. A proportional integral (PI) controller is used in the outer loop for output voltage regulation. The controller was designed using loop‐shaping techniques and applied to regulate an output voltage of 21 V. The design was verified with experimental results in a switching regulator where step changes were applied to the load. The performance of the switching regulator was also tested for variations of the input voltage. |
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| ISSN: | 1755-4535 1755-4543 |